NASA Explorer 11 (S-15), the first spaceborne gamma-ray astronomy satellite, launched by Juno II from Cape Canaveral. Its telescope searched for cosmic gamma rays above 50 MeV until November 1961; the onboard tape recorder failed at launch, so only real-time data were returned.
- Outcome
- Success
- Payload to orbit
- 41 kg
- Flight
- 9th
- of 10 Juno II flights
- Date and time
- 27 April 1961, 14:16 UTC
- Rocket
- Juno II
- Builder
- Chrysler
- Launch site
- Launch Complex 26B, Cape Canaveral SFS, FL, USA
- Payload
- Unknown
- International designator
- 1961-013
- Launches in 1961
- 16th of 50
See it in orbit
Space Atlas shows the satellites and rocket stages from this launch in 3D.
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